JPH0222011A - Supplying method for material - Google Patents

Abstract

PURPOSE:To always mix regenerated material in a predetermined ratio in a molding material by supplying the recycled material to a molding screw, and then mixing it with a main material. CONSTITUTION:Recycled material 19 is supplied from a supply port 121a at the upstream side of a screw 11 of a molding machine. The screw 11 gradually presses the recycled material 19 to the downstream by rotation. Then, main material 17 is supplied from a supply port 121b of downstream side. The insuffi cient content of the material 19 is supplemented with the main material 17 provided at the downstream side from the port 121b, and a groove 11a is sequen tially buried with the materials 19, 17. The grooves 11a of the screw 11 are filled with the materials 19, 17, which are always supplied to an extruder in a predetermined ratio of mixture material.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for supplying raw materials for extrusion molding of synthetic resin films, etc., and is particularly devised to supply 100% recycled raw materials together with the main raw materials in-line. This is what I did.

<Prior Art> Generally, synthetic resin films are manufactured by a synthetic resin film manufacturing apparatus 10 as shown in FIG. As shown in the figure, this manufacturing apparatus 10 has a screw 1 inside.
1 arranged in the axial direction, and a take-up device 1 that takes out the molten synthetic resin 13 extruded from the extruder 12 while stretching it to form a synthetic resin film 15.
4, a winding device 16 for winding up the synthetic resin film 15 taken by the taking-up device 14, and a hopper 18 for supplying granular synthetic resin raw material 17 to the extruder 12. When manufacturing this synthetic resin film 15, the extruded and molded film is regulated on both sides to a predetermined width, and then sent to the winding device 16. For this reason, both sides of the film are cut to a predetermined width in the take-off device 14. At this time, a large amount of film scraps, so-called trimming edges, are generated.

This trimming selvage is recovered as a recycled raw material to be supplied to the extruder 12. A large amount of the collected trimmed stubs is recycled by a raw material recycling device (not shown) provided outside the facility. This regeneration device melts the trimmed selvedges and turns them into granular regenerated raw material 19. The recycled raw material 19 obtained here is mixed with the main raw material using a raw material mixer (not shown), and is then mixed into the hopper 1.
It will be thrown in at 8.

<Problems to be Solved by the Invention> However, in the conventional method, there is a problem in that it is difficult to accurately measure the amount of recycled raw material and the amount of extrusion, and errors are likely to occur. Since the mixing ratio of recycled raw materials and main raw materials is determined based on this numerical value with an error,
It is difficult and virtually impossible to continuously produce a mixed raw material of exactly the same amount of recycled raw material and main raw material as the extrusion amount and supply it to the extrusion device.

That is, in the conventional method, it is impossible to maintain the relationship between the amount of recycled raw material + the amount of main raw material - the extrusion amount, and the left side of the above equation is slightly different from the right side.

Therefore, when continuous operation is performed by constantly supplying recycled raw materials, the amount of mixed raw materials may be too much or too little for the required extrusion amount, and for this reason, 100% of the recycled raw materials cannot be returned to the extrusion equipment, and the recycled raw materials cannot be returned to the extrusion equipment. Either the raw material will remain in the upper part of the tank, or the feedstock will be insufficient for the amount of extrusion.

Present invention 1.1' In view of the above-mentioned circumstances, a raw material supply capable of supplying 100% of the recycled raw material to the extrusion device N and at the same time continuously supplying the recycled raw material to the extrusion device at a predetermined ratio in the line The purpose is to provide a method.

<Means for Solving the Problems> The configuration of the present invention for achieving the above object is to continuously supply a synthetic resin raw material to a molding device, and trim the synthetic resin molded product obtained by this molding device to The trimming surplus is collected, the surplus is remelted and formed into pellet-shaped recycled raw material, and the recycled raw material is supplied to the molding device together with the synthetic resin raw material from the upstream side of the screw of the molding device. is supplied, and the synthetic resin raw material is supplied from the downstream side thereof.

Function> As a result of separating the supply of the main raw material and recycled raw material into the screw and feeding the recycled raw material into the screw before the main raw material, the recycled raw material that comes out continuously and quantitatively is given priority to the screw. It is reliably supplied to the inside.

Embodiment Hereinafter, an embodiment of a synthetic resin film manufacturing apparatus having a suitable raw material supply device for carrying out the method of the present invention will be described in detail with reference to the drawings.

In addition, regarding the explanation of the parts that overlap with those in FIG. 5 of the conventional example,
The same reference numerals are used to omit the explanation.

Fig. 1 is a schematic diagram of the synthetic resin film manufacturing apparatus according to this embodiment, Fig. 2 is a schematic diagram of a hopper that independently supplies recycled raw materials and main raw materials to the screw of an extruder, and Fig. 3 is a schematic diagram of a hopper that independently supplies recycled raw materials and main raw materials to the screw of an extruder. FIG. 2 is a top view, and FIG. 4 is a schematic view showing the raw material supply state.

As shown in these drawings, the synthetic resin film manufacturing apparatus 100 of this embodiment includes an extruder 12;
A taking-off device 1 that takes over the molten synthetic resin 13 extruded from the
4, a winding device 16 that winds up the synthetic resin film 15 taken up by the taking-up device 14, a hopper 118 that supplies the recycled raw material 19 and the main raw material 17 to the extruder 12, and The hopper 118 is provided with a reproducing device 120 for reproducing the trimmed ears to be supplied to the hopper 118.

This hopper 118 has a constricted lower end 118a in the shape of a square pyramid, and a raw material supply tube 121 having a rectangular cross section is provided at the lower end 118a. A partition plate 122 is provided inside the hopper 118 and the supply cylinder 121 so as to extend vertically between them, and the upstream side of the screw 11 is connected to a storage chamber for the recycled raw material 19.
23, the downstream side of the screw is the reservoir chamber 12 for the main raw material 17
It is set at 4. This raw material supply cylinder 121 has a lower end located within a raw material input port 12a provided in a part of the extruder 12, and a flange 125 formed on the outer periphery of the supply cylinder 121 is fixed to the extruder 12. ing.

Further, the upper end opening 118b of this hopper 118 is provided with introduction passages 126 and 127 for the main raw material 17 and the recycled raw material 19, respectively, to the storage chambers 1.23 and 1.24 for the recycled raw material and the main raw material, respectively. Recycled raw material 19 and main raw material 17 are introduced.

Therefore, the raw material supply cylinder 1 provided at this raw material input port 12a from the hopper 118 to the screw 11 in the extruder 12
21, the recycled raw material 19 and the main raw material 17 are each independently supplied. That is, a supply port 121a for supplying the recycled raw material 19 is located on the upstream side of the screw 11, and a supply port 121b for supplying the main raw material 17 is located on the downstream side thereof. First, only the recycled raw material 19 is introduced at a predetermined ratio into the groove 11a of the rotating screw 11. This screw 11 gradually pushes out the recycled raw material 19 toward the downstream side by its rotation. Therefore, the shortage of the predetermined extrusion amount is satisfied from the supply 1121b of the main raw material 17 provided on the downstream side, and the groove portion 11a is sequentially filled with the recycled raw material 19 and the main raw material 17.

In the above, as shown in FIG.
(continuously and quantitatively) - The recycled raw material 19 of the rimming stub is not mixed with the main raw material 17 by the partition plate 122, but is independently and preferentially delivered 100% to the groove 11a of the empty screw 11. Filled. At this stage, there is still a space in the groove 11a of the screw 11 and there is a shortage of supply, but the buried recycled raw material 19 is transported toward the tip of the screw 11, and the space is previously filled in the storage chamber 124 for the main raw material 17.
The groove 11a of the screw 11 is filled with the main raw material 17 stored in the main raw material 17.
fulfilled by.

In this way, the recovered recycled raw material is 100% returned to the extruder, and becomes a mixed raw material mixed with the main raw material at a constant ratio, and is supplied without excess or deficiency with respect to the extrusion amount even in continuous operation.

In addition, compared to the conventional method where recycled raw materials are processed in a separate process and then mixed with the main raw materials, the recycled raw materials do not stay in the upper part of the hopper, and furthermore, according to the method of the present invention, the equipment is compact. The recycled raw material can be reduced continuously.

<Effects of the Invention> As described above in detail along with the examples, according to the method of the present invention, the recovered recycled raw material is regenerated and reduced with 100% efficiency, and it becomes a mixed raw material that is mixed with the main raw material at a predetermined ratio and is continuously processed. Even when operated all at once, the mixed raw material can always be supplied to the extrusion device at a predetermined ratio.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a synthetic resin film manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a raw material supply device having a hopper, FIG. 3 is a top view of FIG. 2, and FIG. 5 is a schematic diagram showing the raw material supply state, and FIG. 5 is a schematic diagram of a conventional synthetic resin film manufacturing apparatus. In the drawings, 11 is a screw 12 is an extruder, 17 is a main raw material, 19 is a recycled raw material, 100 is a synthetic resin film manufacturing device, 118 is a hopper 120 is a recycling reduction device, 121 is a raw material supply cylinder, 122 is a partition plate, 23 24 is a storage room for recycled raw materials, and 24 is a storage room for main raw materials.

Claims (1)

[Claims] The synthetic resin raw material is continuously supplied to a molding device, the synthetic resin molded product obtained by this molding device is trimmed, the trimming surplus is collected, and the surplus is remelted and molded into pellet-shaped recycled raw material. A raw material supply characterized in that the recycled raw material is supplied to the molding device together with the synthetic resin raw material from the upstream side of the screw of the molding device, and the synthetic resin raw material is supplied from the downstream side thereof. Method.